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Application

Liquiline CM14 is a 4-wire transmitter with a compact design for mounting in control panels or cabinets. Possible areas of application are wastewater treatment, water preparation and monitoring of drinking water, ion exchangers and surface water monitoring.

Function

Sensors for pH, conductivity and oxygen record the measurement values at the site. These are transmitted digitally to the Liquiline CM14 transmitter using Memosens technology.The transmitter converts the signal into an 0/4 to 20 mA signal. In addition to this, temperature can be output as a second current signal. Two limit relays enable monitoring of signals for minimum,

2 × 0/4 to 20 mA active, potentially isolated from one another and from the sensor circuit

Load

Max. 500 Ω

Linearisation/ transmission behaviour

Linear

Status output

"Open collector"

Relay output

Relay type

2 changeover contacts

Switching current

Max. 0.5 A @ 24 V DC

max. 0.5 A @ 253 V AC

min. 100 mW (5 V / 10 mA)

Cable cross section

max. 2.5 mm² (14 AWG)

Power supply

Supply voltage

Wide range power supply 24 to 230 V AC/DC (–20 % / +10 %) 50/60 Hz

Performance characteristics

Response time

Current output t90 = max. 500 ms for an increase from 0 to 20 mA

Reference temperature

25 °C (77 °F)

Resolution current output

>13 Bit

Installation conditions

Mounting location

Panel, cutout 92 × 45 mm (3.62 × 1.77")

Max. panel thickness 26 mm (1")

Mounting orientation

The mounting orientation is determined by the display readability

Max. angle of view +/– 45° of the display center axis in each direction.

Environment

Ambient temperature range

–10 to +60 °C (14 to 140 °F)

Storage temperature range

–40 to +85 °C (–40 to 185 °F)

Electromagnetic compatibility

Interference emission and interference immunity as per EN 61326-1:2006, class A for industrial use

Ingress protection

Front: IP65 / NEMA 4X

Body: Protection against contact IP20

Relative humidity

5 to 85 %, non-condensing

Mechanical construction

Weight

0.3 kg (0.66 lbs)

Materials

Housing, body: Polycarbonate Front membrane: Polyester, UV resistant

Terminals

max. 2.5 mm² (14 AWG) Mains, relays

Certificates and approvals

CE mark

Declaration of conformity

The product meets the requirements of the harmonized European standards. It thus complies with the legal requirements of the EC directives. The manufacturer confirms successful testing of the product by affixing the CE symbol.